Portable charging device



FIG. 1 is a front view of a portable charging device showing my new design;

FIG. 2 is a right side view thereof

FIG. 3 is a left side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a top, front, right side perspective view thereof; and,

FIG. 8 is a top, front, left side perspective view thereof.

The broken lines shown in the drawings illustrate portions of the portable charging device that form no part of the claimed design. 

CLAIM The ornamental design for a portable charging device, as shown and described. 